News from GRDC Advisors Update
I recently attended the GRDC Crop Advisors Update (two days in Ballarat). In this newsletter I share some of the interesting information and ideas presented at the conference.
1. The Outlook for Crops – Mick Keogh
Factors Affecting Demand
The world’s population continues to grow rapidly, by approximately 70+ million pa. As a country’s average income moves from $5,000 (US) to $15,000 (US) pa, people rapidly move to consuming more animal protein, particularly pork and poultry. In India and China average incomes are just moving from $5,000 to $7,000 pa. Animal protein demand is consequently increasing and this in turn increases the demand for feed grains. China’s population consumed 400 cal / day in 1990 – it now consumes 600 cal / day.
- Increased use of Bio-fuels
In 2007 5% of cereals, 9% of oil seed and 10% of sugar was used for bio-fuels. This will increase by 30-50% by 2020. Population growth, combined with bio-fuels will see demand for grains increased by 2- 2.5% pa. To date, supply has kept up with demand.
Factors Affecting Supply
- Availability of arable land
The US had 300 million acres available in 1980. It now has ~250 million acres. Globally however, the area cropped has increased significantly between 2001 and 2009. This increase is coming from sub Saharan Africa and South America. The world has large, potentially croppable areas which are not currently tapped into. The rate of yield growth in crops is now less than what is was. In the 1960s it was 3.6% pa, now it is 1.4%. A 2°c increase in temperature (from global warming) will see the loss of some cropping lands, but it will also allow the cropping zones of the northern hemisphere to expand and it could increase world supply of grain.
Overall, there is a strong picture for crop prices in the years ahead. Crop prices however remain more vulnerable to volatility, e.g. a drought in a major producing country could result in sharp increases in price.
2. New test provides better guide to crop responses
Fertiliser costs are a major crop input (and also for pasture). On average, the cost of P accounts for around 15% of crop input costs. Consequently is it important that we apply P when we are confident of the crop response it will achieve. To date, Olsen and Colwell P tests have provided a guide, but one that does not strongly correlate with yield responses.
A new technology has been developed by Lancaster University UK called the Diffusive Gradient Test (DGT). This, in combination with the Phosphorus Buffering Index (PBI), can be used to decide a recommended rate of application which shows a high degree of correlation (76%) to expected yields.
Although the technology is already showing good results in trials, it is not likely to be commercially available until 2013.
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